自定义View 礼物

package com.example.cll.zidingyiview;import android.animation.Animator;import android.animation.AnimatorListenerAdapter;import android.animation.AnimatorSet;import android.animation.ObjectAnimator;import android.animation.TypeEvaluator;import android.animation.ValueAnimator;import android.content.Context;import android.graphics.Bitmap;import android.graphics.BitmapFactory;import android.graphics.Canvas;import android.graphics.Color;import android.graphics.Paint;import android.graphics.Path;import android.graphics.Point;import android.graphics.PorterDuff;import android.util.AttributeSet;import android.view.MotionEvent;import android.view.View;import android.widget.ImageView;import android.widget.RelativeLayout;import java.util.Random;/** * Created by cll on 2017/12/19. */public class CustomView extends RelativeLayout implements View.OnClickListener {    private Bitmap mBitmap;    //画笔，路径    private Paint mPaint;    private Path mPath;    //记录屏幕的宽，高    private int mScreenWidth;    private int mScreenHeight;    //记录数据点，控制点(由于是三阶贝塞尔曲线，所以有2个控制点)    protected Point mStartPoint;    protected Point mEndPoint;    protected Point mConOnePoint;    protected Point mConTwoPoint;    protected Random mRandom;    protected int[] mColors = {Color.BLUE, Color.CYAN, Color.GREEN, Color.RED, Color.MAGENTA, Color.YELLOW};    public CustomView(Context context) {        super(context);        initView();    }    public CustomView(Context context, AttributeSet attrs) {        super(context, attrs);        initView();    }    public CustomView(Context context, AttributeSet attrs, int defStyleAttr) {        super(context, attrs, defStyleAttr);        initView();    }    /**     * 进行一些初始化的操作     */    private void initView() {        //初始化画笔，路径        mPaint = new Paint(Paint.ANTI_ALIAS_FLAG);        mPaint.setStrokeWidth(8);        mPaint.setStyle(Paint.Style.STROKE);        mPaint.setColor(Color.BLACK);        mPath = new Path();        mRandom = new Random();        //获取资源图片转化Bitmap（不可修改）        mBitmap = BitmapFactory.decodeResource(getResources(), R.mipmap.icon_star);        setOnClickListener(this);    }    /**     * 画星星并随机赋予不同的颜色     *     * @param color     * @return     */    private Bitmap drawStar(int color) {        //创建和资源文件Bitmap相同尺寸的Bitmap填充Canvas        Bitmap outBitmap = Bitmap.createBitmap(mBitmap.getWidth(), mBitmap.getHeight(), Bitmap.Config.ARGB_8888);        Canvas canvas = new Canvas(outBitmap);        canvas.drawBitmap(mBitmap, 0, 0, mPaint);        //利用Graphics中的XferModes对Canvas进行着色        canvas.drawColor(color, PorterDuff.Mode.SRC_IN);        canvas.setBitmap(null);        return outBitmap;    }    protected void addStar() {        Bitmap starBitmap = drawStar(mColors[mRandom.nextInt(mColors.length)]);        final ImageView imageView = new ImageView(getContext());        RelativeLayout.LayoutParams layoutParams = new RelativeLayout.LayoutParams(120, 100);        layoutParams.addRule(CENTER_HORIZONTAL);        layoutParams.addRule(ALIGN_PARENT_BOTTOM);        imageView.setImageBitmap(starBitmap);        addView(imageView, layoutParams);        Point conOnePoint = this.mConOnePoint;        Point conTwoPoint = this.mConTwoPoint;        Point startPoint = this.mStartPoint;        Point endPoint = this.mEndPoint;        //设置属性动画        ValueAnimator valueAnimator = ValueAnimator.ofObject(new StarTypeEvaluator(conOnePoint, conTwoPoint), startPoint,                endPoint);        valueAnimator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {            @Override            public void onAnimationUpdate(ValueAnimator animation) {                Point point = (Point) animation.getAnimatedValue();                imageView.setX(point.x);                imageView.setY(point.y);            }        });        valueAnimator.addListener(new AnimatorListenerAdapter() {            @Override            public void onAnimationEnd(Animator animation) {                super.onAnimationEnd(animation);                CustomView.this.removeView(imageView);            }        });        //透明度动画        ObjectAnimator objectAnimator = ObjectAnimator.ofFloat(imageView, "alpha", 1.0f, 0f);        //组合动画        AnimatorSet animatorSet = new AnimatorSet();        animatorSet.setDuration(4000);        animatorSet.play(valueAnimator).with(objectAnimator);        animatorSet.start();        valueAnimator.start();    }    /**     * 获取屏幕的宽高并设置对应的数据点和控制点     *     * @param w     * @param h     * @param oldw     * @param oldh     */    @Override    protected void onSizeChanged(int w, int h, int oldw, int oldh) {        super.onSizeChanged(w, h, oldw, oldh);        this.mScreenWidth = w;        this.mScreenHeight = h;        mStartPoint = new Point(mScreenWidth / 2, mScreenHeight);        mEndPoint = new Point(mScreenWidth / 2, 0);        mConOnePoint = new Point(mScreenWidth, mScreenHeight * 3 / 4);        mConTwoPoint = new Point(0, mScreenHeight / 4);        //为了调用onDraw方法        setBackgroundColor(Color.WHITE);    }    @Override    protected void onDraw(Canvas canvas) {        super.onDraw(canvas);//        mPath.moveTo(mStartPoint.x, mStartPoint.y);//        mPath.cubicTo(mConOnePoint.x, mConOnePoint.y, mConTwoPoint.x, mConTwoPoint.y, mEndPoint.x, mEndPoint.y);//        canvas.drawPath(mPath, mPaint);    }    class StarTypeEvaluator implements TypeEvaluator<Point> {        //记录控制点        private Point conOnePoint, conSecondPoint;        public StarTypeEvaluator(Point conOnePoint, Point conSecondPoint) {            this.conOnePoint = conOnePoint;            this.conSecondPoint = conSecondPoint;        }        @Override        public Point evaluate(float t, Point startValue, Point endValue) {            //利用三阶贝塞尔曲线公式算出中间点坐标            int x = (int) (startValue.x * Math.pow((1 - t), 3) + 3 * conOnePoint.x * t * Math.pow((1 - t), 2) + 3 *                    conSecondPoint.x * Math.pow(t, 2) * (1 - t) + endValue.x * Math.pow(t, 3));            int y = (int) (startValue.y * Math.pow((1 - t), 3) + 3 * conOnePoint.y * t * Math.pow((1 - t), 2) + 3 *                    conSecondPoint.y * Math.pow(t, 2) * (1 - t) + endValue.y * Math.pow(t, 3));            return new Point(x, y);        }    }    @Override    public void onClick(View v) {//        mStartPoint = new Point(mScreenWidth / 2, mScreenHeight);//        mEndPoint = new Point((int) (mScreenWidth / 2 + 150 * mRandom.nextFloat()), 0);//        mConOnePoint = new Point((int) (mScreenWidth * mRandom.nextFloat()), (int) (mScreenHeight * 3 * mRandom.nextFloat() / 4));//        mConTwoPoint = new Point(0, (int) (mScreenHeight * mRandom.nextFloat() / 4));////        addStar();    }    /**     * 监听onTouch事件，动态生成对应坐标     * @param event     * @return     */    @Override    public boolean onTouchEvent(MotionEvent event) {        mStartPoint = new Point(mScreenWidth / 2, mScreenHeight);        mEndPoint = new Point((int) (mScreenWidth / 2 + 150 * mRandom.nextFloat()), 0);        mConOnePoint = new Point((int) (mScreenWidth * mRandom.nextFloat()), (int) (mScreenHeight * 3 * mRandom.nextFloat() / 4));        mConTwoPoint = new Point(0, (int) (mScreenHeight * mRandom.nextFloat() / 4));        addStar();        return true;    }}